<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div align="center">
    <h2>hello world</h2>
    <hr>
    <p>看到这个页面说明程序已正常运行。</p>
</div>
</body>
</html>
